136 



Notes on the Meteorology 



From this table the following mean monthly temperatures 

 are obtained : — 



January 



February 



March 



April 



May... 



June 



July... 



6610 

 66-07 

 60:70 

 56-28 

 46-92 

 43-92 

 40-58 



August 



September 



October 



November 



December 



47-07 

 49-26 

 53-07 



57-75 

 62-03 



Mean annual temp. 53-34 



And also the mean temperature for the seasons, as follow : — 

 Spring, 53 ; Summer, 64 ; Autumn, 54 ; Winter, 43. 



The variation to which the law of decrease of temperature 

 with elevation is subject is well shown by many localities in 

 the Australian Alps, particularly by the presence of many 

 tropic types of vegetation in the humid soils on the most 

 southern slopes, at elevations of 3000 feet ; and the mean 

 temperature is probably greater — at similar elevations — on 

 the northern sunny slopes than on the moist southern slopes ; 

 and the absolute range of temperature is also greater on the 

 former than on the latter at similar elevations. Again, those 

 localities open to the cooling influence of polar winds would, 

 doubtless, show a lower mean annual temperature than 

 those localities on the same latitude, at the same elevation, 

 although exposed to the warming influence of equatorial 

 winds. 



The following table gives the mean monthly temperature 

 of the surface of the ground at 9 a.m., and also that for the 

 seasons : — 



Summer. 



Winter. 



Spring. 



December 

 January , 

 February , 



79-52 

 79-60 

 81-82 



March 



April 



May 



70-93 



66-00 

 49-56 



June 



July 

 August 



46-43 

 45-41 

 55-37 



Mean temp. 80-45 



Mean temp. 62-16 



Mean temp. 49 07 



September 57-27 

 October .. 65-04 

 November.. 7000 



Mean temp. 64-10 



This gives a mean annual surface temperature in the sun of 

 63° 88', or a little over 10 degrees higher than the mean 

 annual temperature of the air in the shade, four feet from 

 the ground. This large mean annual surface temperature 

 must necessarily affect the amount of spontaneous evapora- 

 tion at Omeo. 



